export function MP(ak) {
         return new Promise(function (resolve, reject) {
              window.init = function () {
             resolve(BMap)
        }
       var script = document.createElement("script");
       script.type = "text/javascript";
       script.src = "http://api.map.baidu.com/api?v=2.0&ak="+ak+"&callback=init";
       script.onerror = reject;
       document.head.appendChild(script);
     })
   }
